And isidore



Sheet 1.

2 Sheets (No MUdeI.)

C. A. HOMANS.

ELECTRIC LAMP.

N0.`367,o0z. Patented Ju1y'19, 1887.

N. 11n-rens, PhmmLilhcgnphu. wnshingmn. D. c.

' (No Model.) 2 sheets-sheet 2.

C. A. HOMANS.

ELECTRIC LAMP. No. 367,002. Patented July 19,1887.

...Wm @2% fw L@ N. PETERS. PnwLilhagmphr. washington. D. C.

UNITED STATES PATENT EETCE.

CHARLES AiioMANS, CE WTNCHESTER, MASSACHUSETTS, ASSIGNCR, RY DIRECT AND MESNE ASSIGNMENTS, To LYDIA E. ROMANS, or SAME PLACE, OSCAR E. GUNZ, CE RUTHERECRD, NEW JERSEY, AND ISTDCRE L. BAEZA, OF NEW YORK, N. Y.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 367,002, dated July 19, 1887.

Application filed July 19, 1886. Serial No. l-3,378. (No model.)

Y To @ZZ whom it may concern.-

Beit known that I, CHARLES A. HCMANS,y

tain new and useful Improvements in Electric Lamps, of which the following is aspecication.

This invention relates to certain new and useful improvements in that class of electric ro lamps in which two carbon electrodes are used, and in which the light-arc is formed in p a gas that does not affect the carbons injuriously.

The object of-my invention is to facilitate the detaching of those parts of the lamp in which the upper-carbon holder and the helix for governing the upper carbon are held, and also to facilitate removing and adjusting the lower carbon and cleaning the lamp.

A further object of my invention is to simplify the construction of the lamp.

The invention consists in the construction and combination of parts and details, as will be fully described and set forth hereinafter. e

In the accompanying drawings,xFigure l is a cross-sectional view of the upper part of the lamp. Fig. 2 is a sectional detail View of the lower part of the helix and the upper-carbon holder. Fig. 3 is a cross-sectional view of the 3o lowerpart of the`lamp.

Similar letters of reference indicate corresponding parts.

The lamp-globe Ais provided at its top with au external screw-threaded neck, B, on which k a ring, C, is screwed, provided on its upper end with an exterior flange, D. A suitable packing-such as red-lead, Whiting, rubber, cement, or other like materialis spread on the thread before screwing on the said ring. 4o A. packing-ring, E, is placed ou the iiange D, and on said ringE the lower annular exterior ange, F, of a circular cap,l G, is placed, and bolts H, provided With nuts, are passed through apertures in the flanges DF and the packingring E, and the nuts drawn up tight for the purpose of forming atightjoint. In place of bolts and nuts, ordinary Screws or like fast-en- 'ing devices may be used for holding the flanges and packing-ring together. On the middle of the top of the cap G a cylinder, J, is formed, 5o which is of less diameter than the Said cap, as shown, which cylinder is provided at the upper end with au outwardly-projecting annular flange, K, on which a packing-ring, K', is placed, and on which packing-ring the exteterior annular flange, L', of the cap L is placed,

'and bolts L2, provided with nuts, are passed through the flangesL' L and the packing-ring K. The cap Lis open at the bottom and closed at the top. In the upper part of the cylinder 6o J a cross-piece, M, is fastened, from which a tube, O, is suspended by means of a ball-and` socletjoint, O'; A wire is coiled around the tube, O, forming the helix l?, one end of the wire of the helix being connected with the binding-post Q, fastened in an insulatingpiece, Q', in the side ofthe cylinder J, and on the said binding-post Qthe positive line-wire a is held by a screw of the usual construction. The other end of the wire, forming the helix, 7o is connected by the wire b with the upper-carbon clamp R, provided with the binding-screw R', which carbon-clamp It is fastened at the lower end to the carbonholder rod S, passed through the tube O. A spring-tongue, T, is fastened on a plate on the bottom of the helix l?, and its free end rests against the carbonholder rod S.

A pin, U, projects from the carbon-holder rod S a distance from' the top of the carbon- 8o clamp R greater than thelength of the spring-I tongue T, for a purpose that will be set forth hereinafter. The helix P is surrounded by a met-al covering, P', against which the inner ends of three screws,V. rest,which are screwed through projections V', formed on the inner surface of the cylinder J, near the lower end of the same.

rIhe bail I for hanging the lamp is provided at its top with an eye, I', and is passed through 9o aperturesin the ends of the cross-piece W, resting on the top of the cap L, and through an exterior flange, W', formed along the top edge of the cap G. Hooks c are formed on the lower ends of the Shanks of the bail I, and are passed through loops d, fastened on the flange F along the bottoni edge of the cap (lr. Nuts c are screwed on the shanks of the bail l, directly above the cross-piece lV, anda binding-screw, f, is screwed through the crosspiece W', at the middle of the same, and into the cap Ii, for the purpose of holding and binding the cross-piece XV on the top ofthe cap Ii.

The globe A is provided in its bottom with an aperture, f. On the inner surface of the bottom of the lamp, at the said aperture f', a cushion, r/, of cork covered with asbestus, is placed, and on said cushion tf/ a metal disk, 71, is placed, which is provided with a recess, t', for receiving the rounded bottom buttoluj, formed on the lower end ofthe carbon-holder k, which is provided with a binding-screw or any other suitable device Vl'orholding the lower carbon. On the under side of the lamp-globe a cushion, Z, made ot' cork and covered with asbestus, is placed, which ring is provided at its middle with a neck fitting into the aperture f. A brass disk, m, having a central screw-threaded aperture and provided with a screw-thread on its rim, is placed against the asbestus-covered cushion Z, and a heavy softrubber packing-ring, a, is rested against the brass disk m. A metal disk, o, having a screw-threaded aperture, is placed against the bottom of the rubber cushion n, and has a smooth outer rim. The rod p, having ascrewthread formed on its upper part, is screwed through the threaded aperture of the disk o, passed through the rubber cushion n, screwed through the disk nl., passed through the aperture in the asbestus-covered cushion g, and its upper lend is screwed into the rounded bottom of the button ofthe lower-carbon holder. A cylindrical casing, r, having its upper part threaded internally, is screwed on the outside of the disk in, and surrounds the packing n and the disk o. The conducting-wire s for the lower carbon is held by a binding-screw, t, on the lower end ofthe rodp. Two or more screws, U, are screwed through internal projections ofthe casing 1', and at their free ends rest against the rod p.

By holding the lower-carbon holder Zt' and turning the rod A7) the cushion Z is pressed against the bottom of the globe, and the button j on the lower-carbon holder is drawn downward, and as it exerts a pressure on the plate h the cork disk g betweensaid plate and the inner surface of the button is pressed downward against the innersurface of the bottorn of the globe, whereby an absolut-ely tight joint is formed. By turning the disk o, by means of a suitable implement, it is moved up toward the disk m, whereby the rubber packing n between the disks o and m is compressed and bulged outward, so that its outer edges press against the sides of the cylindrical casing, thereby forming a tightjoint.

The lower carbon can be adjusted to have any desired inclination by means of the screws U. The screws U on the one side are loosened and the screws U on the otherside turned up, and acting on the rod P press it in the direction in which the screw that is drawn up moves. The button j forms the fulcrum on which the rodj) nieves, and the carbon is removed iu the inverse direction of the rod. As the button j is rounded, it fits in the recess formed in the plate Zi.- When it is desired to clean the lamp, the wire a is disconnected, the bolts It removed, and the cap G unscrewed, and thercd O and the helix P are all removed from the globe. The neck B of the globe is of su fiieient width to permit the inserting of the hand and a cloth, rag, or wiper to permit the lcleaning of the inside of the globe.

The upper-carbon holder can be adjusted by means of the screws V. As the rod S moves up and down in the tube O, the end of the spring T slides on the surface of the rod and keeps the said su rface clearand bright, thereby preventing oxidation, which is absolutely nceessary for preventing the sparking of the lamp. The pin U is provided at such a distance from the bottom of the rod S that thesaid pin strikes the bottom of the helix and. prevents the same from moving higher in the tube O. Otherwise it might happen that the spring-tongue T would snap over the top plate of the clamp and hold the upper carbon raised and prevent it from descending.

I am aware that itis not new to connect the line-wire direct with the wire of t-he helix, or the wire of the helix direct with the uppercarbon holder. I am also aware that it is not new to adjust the inclination ofthe upper and lower carbons by means of screws the ends of which act on the carbon-holders, and I do not claim these constructions, broadly.

Having-thus described inyinvention, I claim as new and desire to secure by Letters Patent-M 1. In au elect-rie lamp, the combination, with a globe having a neck, of a cap on said neck, on which cap a cylinder is formed, a crosspiece in the cylinder, a tube jointed to and suspended from the cross-piece, and a helix formed on the said tube,substantiall y as herein shown and described.

2. In an electric lamp, the combination of a globe having a neck, a ring held on said neck, a cap on the ring, from the top ofwhich a, cylinder projects, a cross-piecebn the top of the cylinder, a tubejointed toand suspended from the cross-piece, a helix formed on, the said tube, adj listing-screws passed through the sides of the cylinder and resting against the outer surface of the helix, substantially as shown and described.

3. In an electriclamp, the combination, with ahelix, of a carbon-holding rod passed through the bore of the helix and a spring-tonguel fastened on the helix and resting freely against said carbon holding rod, substantially as shown and described.

4t. In an electric lamp, the combination, with the helix, of a carbon-holding rod passn ing freely through the bore of the helix, a spring-tongue fastened to the lower end of the helix and having its free end resting against said carbon-holding rod, and a pin projecting 'from the carbon-holding rod a distance from the lower end of the same slightly greater than the length of the spring-tongue, substantially as shown and described.

5. In an electric lamp, the coi1ibination,with a helix, of the carbon holding rod passed through the bore of the helixand a scraper resting against the holding-rod and fixed to the lower end of the helix, substantially as A shown and described.

6. In an electriclamp, the combination, with a globe having a bottom aperture, of cork cushions resting on the inner and outer surfaces of said globe at said aperture, a carbonholder provided with a rounded button, adisk placed on the Lipper surface of the inner cushion, on which disk the rounded button rests, and a screw-rod screwed into said rounded button or head, substantially as set forth.

7. In an eleetriclamp, the combination, with a globe having a bottoni aperture, of cork cushions resting on Athe inner and outer surfaces of the globe at said aperture, a carbonholder resting on a plate or disk on the inner cushion, a disk below the outer cushion, and

a screw passed through the said several disks and cushions and passed into the carbonholder, substantially as shown and described.

8. In an electric lamp, the combination,with

the globe, ofthe cushions g Z on the inside and outside of the globe, the disk h, resting on the inner cushion, g, the disk m, resting against the bottom of the lower cushion, which disk has its outer edge screw-threaded, the cylindrical casing r, screwed on the disk on, the rubber packing n, resting against the disk m, the

disk o below the same, the carbon-holder k, and

invention I have signed my name in presence 45 of two subscribing witnesses.

CHARLES A. HOMANS. fitnessesz OsoAR F. GUNZ, SIDNEY MANN. v 

